Drafting-machine.



E. c. KREISLE & L. 0. HAWKINS. DRAFTING MACHINE.

APPLICATIGN FILED IULYZ I, I914.

Patented Mar. 21, 1916.

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E. C. KREISLE & L. D. HAWKINS.

DRAFTING MACHINE. APPLICATION FILED mm 21. 1914.

1,176,469. Patented Mar. 21, 1916.

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UNITED STATES PATENT OFFICE EDWIN CLINTON KREISLE AND LYNDSAY DICKASON HAWKINS, 01 AUSTIN, TEXAS.

DRAFTING-MACHINE.

Specification of Letters Patent.

Patented Mar. 21, 1916.

Application filed July 27, 1914. Serial No. 853,451.

To all whom it may concern:

Be it known that we, EDWIN CLINTON KREISLE and LYNDSAY I)I(IKASON HAwKINs, each a citizen of the United States, and residing in the city of Austin, in the county of Travis and State of Texas, have invented a new and useful Drafting-Machine, of which the following is a specification.

The invention hereby intended to be patented relates to a new and, so far as we have reason to believe, a pioneer machine embodying the methods hereinafter described, for the purpose of constructing or drafting in an accurate, expeditious, and scientific manner, geometric figures, particularly the circle, the octagon, the hexagon, the pentagon, the square, an ellipse, a parabola, a right angle triangle, an isosceles trlangle, a five pointed star, and a right and a left volute.

This invention is intended to accomplish such results by means of the revolution of a pencil around the center of the figure to be drafted, which pencil has, at the same time, additional motions toward and away from the center of such figure. The revolving motion of such pencil around the center of the figure to be drafted is accomplished by means of tracks attached to, and protruding from, a central vertical post. which is revolved by a handle. The additional motions of such pencil toward and away from the center of such figure is accomplished by means of a cylinder which is also attached to said central vertical post and which likewise revolves around the center of such figure and also simultaneously rotates upon. and in conjunction with, its axis, which said axis is supported by, and revolves with, said central vertical post. the rotation of said axis being obtained by means of a gear affixed thereto working on a stationary gear supported, with the other parts of the machine. by a tripod. Said cylinder is provided with a series of sunken threads, one for each figure to be drafted, accommodating an upright post attached to, and a part of, a carriage which slides freely along said track. said thread being so cut as, when the upright post aforesaid is properly adjusted in the proper thread and the machine is put into operation, to force said carriage, and with it said pencil, toward and away from the center of the figure to be drawn. as said central vertical postrevc1ves, in such a definitecourse-as to produce the intended figure. We attain these objects and apply the principle of the motions of such pencil, as aforesaid, by the mechanism illustrated in the accompanying drawings, in which Figure 1 is a combination of a sectional and a side view of the machine, all that part of the figure lying to the left of a perpendicular line bisecting the figure being a vertical section, and all that part lying to the right thereof being a side view. Fig. 2 is an end view of the machine as it appears in Fig. 1 with a cylinder and one leg of the tripod which supports the machine removed. Fig. 3 is a vertical section taken on the line B B of Fig. 1, of the double carriages described below. Fig. 4 is an end view of the cylinders hereinafter described. Fig. 5 is a vertical section taken on the line A A of Fig. 3 of the lower one of said carriages. Figs. 6, 7, 8, and 9 are side views of cylinders showing threads so designed and cut as to produce the figures hereinbefore mentioned.

Similar letters refer to similar parts throughout the several views. We employ the small letters of the alphabet, a, b, 0, etc., to denote the smaller parts of the machine and a. b, 0', etc., to denote the threads on the cylinders. there being no conflict in the use of those letters.

The entire machine is supported by the tripod E, the upper ends of whose legs are inserted in the piece A and held by setscrews, and the lower ends of whose legs are fitted with soft rubber shoes 6, to preclude slipping and to enable the pencil hereinafter described to be lowered with pressure. This tripod rests on the drawing board, or drawing surface, over the figure to be drafted, the point on the paper which is equidistant from the three feet of the tripod being the center of the figure to be drafted.

The piece A is supported by the tripod E, and it in turn supports the remaining parts of the machine, except as some weight may fall at the point f and on the pencil j. The lower part of piece A is a stationary gear, upon which the rotating gear H works, as hereinafter described.

A'central vertical post B rests at the point f at the center of the figure to be drafted and extends upward through piece A, having attached at its upper end the crank D, to which crank is fixed the handle a, by means of which the machine is operated, as hereinafter described. The crank D performs the additional service of preventing the central vertical post B frcm slipping down through piece A. The central vertical post B has two shoulders, the upper one fitting against the bottom of piece A to prevent the post from slipping up through piece A, and the lower one fitting against the top of piece G to prevent the track and carriages hereinafter described from slipping up on piece B.

Through the central vertical post B is placed the horizontal axis C, which is square at both ends and round where it goes through piece B, to enable it to rotate therein, and which supports and turns two hollow cylinders F, one on either side of piece B. Motion is imparted to said axis C by means of the gear H, mechanically attached thereon, working on the gear at the bottom of piece A, which is stationary. Said cylinders are fastened on either end of said axis C by means of the fastener shown in Fig. 4. A flat spoke K is located in each end of such cylinders, having a square hole in its center in and through which said axis C fits. One such spoke in each cylinder is removed from the end of the cylinder to a position within the cylinder so as to fit, when the cylinders are in positivn, flush with gear H, or with piece B, as the cylinders are interchangeable, and the other is flush with the end of the cylinder. To each spoke which is flush with the end of the cylinder is affixed an oblong slide t, attached to such spoke by means of screws 8 screwing into said spoke and through an oblong slot 14 in such slide. said slide having a square hole in the middle of said slot to admit said axis C. hen the cylinder is in place the slide t may be moved so that the shoulders formed by said square hole in said slot take a position inside two grooves 77 cut on opposite sides of said axis C, thus holding such cylinder in place.

Into piece G are screwed the tracks (Z, and through piece G the double rod, or hairpin, e freely slides. Piece G is supported both by piece 7, which screws into the bottom of piece B, and by a thumbscrew n. In each side of the central vertical post B is a hole into which the thumb-screw n screws, thus enabling piece G, and with it the tracks (Z, the double rod, or hairpin, e, and the carriages I and J, to be swung freely from a position beneath one cylinder to a position beneath the other, and to be firmly held in such position.

The carriage I slides at will on the two upper tracks (Z, and may be fastened to the double rod, or hairpin, e by means of a thumbscrew Z, and to the track (Z by means of a thumbscrew 7a. This carriage contains an upright post m. which is raised into and lowered out of the grooves on a cylinder by means of piece 9. From an edge of the end double rod, or hairpin,

of piece 9 a round pin protrudes into an aperture o in the post m so that when the piece 9 is turned on its axis by means of the thumbscrew at its end opposite said pin, the

post m will be forced alternately up and P down. Piece 9 is held in place by the setscrew 1", which may be used to regulate the friction with which the piece 9 turns.

The carriage J slides at will on the two lower tracks (l and may be fastened to the double rod, or hairpin, e by means of a thumbscrew h, and to the track (1 by means of a thumbscrew i. This carriage contains a pencil j which rests upon the drawing surface and sketches the figure to be drafted.

The pencil j fits into a hole 1 in the carriage J, and is securely held in place by means of a spring a: and thumbscrew, as shown in Fig. 5. The spring as is preferably curved to distribute friction against the pencil j, and fits down into said hole in the carriage J, being fastened thereto by a screw .2 through an elbow 02 at its upper end. By means of the thumbscrew w the grip of the spring m on the pencil j may be tightened or released.

The double rod, or hairpin, e sliding through both carriages I and J, and both said carriages clearing each other when sliding on said double rod, or hairpin, 6 it is possible by fastening the carriage J to said a at the proper distance from the center of the figure to be drafted, and fastening the carriage I to said double rod 0, and adjusting the post m into the proper thread, to force the pencil to approach and to recede from the center of the figure to be drafted in a fixed and definite course, such course being determined by the design of the thread used.

The thread a is designed to draft the circle. and is a simple band groove sunk into and girding the cylinder F. By this groove the pencil j is not moved toward nor away from the center of the figure to be drafted as the cylinders revolve around the central "ertical post B. The circle may be drawn by this machine also by dropping the post we, fastening the carriage I to the track d at the desired radius from the point at f, and operating the machine.

The groove 6 is designed to draft the octagon, and is cut into the cylinder in such manner as to force the pencil 7' to approach a proper distance toward and to recede a proper distance from the center at f. in the proper fixed and definite course, eight times during one revolution of the cylinders around the central vertical post B. Likewise. the grooves a, d, e, f, h, z", and j are designed to draft. respectively, the hexagon, the pentagon, the square, an ellipse, a right angle triangle, an isosceles triangle. and a five pointed star, and are cut into the cylinder in such manner as to force the pencil j to approach proper distances toward and to recede proper distances from the center at f, in the proper fixed and definite courses, six, five, four, two, three, three, and five times, respectively, during one revolution of the cylinders around the central vertical post Thegroove g is designed to draft a parabola, and is cut into the cylinder in such manner as to force the pencil j to approach a proper distance toward, and to recede a proper distance from, the center at f, in the proper fixed and definite course, twice during one revolution of the cylinders around the central vertical post B. Inasmuch as the ends of a parabola continue to infinity, we have designed a figure the curved part of which constitutes a parabola, two points whereon, equidistant from the center at f are connected by the are of a circle, which figure the groove 9' is designed to construct.

The grooves and Z are designed to draft, respectively, a right and a left volute, and are cut into the cylinders in such manner as to force the pencil j to approach the center at f, in the proper fixed and definite courses and at a proper rate per linear unit of distance traversed, as the cylinders revolve around the central vertical post B.

All the grooves aforesaid, except the grooves in and Z, which are designed for drafting. respectively, a right and a left volute, are designed in the drawings to draft a figure which may be inscribed within a circle three inches in diameter. Larger or smaller figures may be constructed by increasing or diminishing the pitch of the respective grooves on the cylinders, and if necessary to facilitate the movement of the post m in the grooves, increasing the diameter of the cylinders, and increasing or diminishing. according to the size of the figure to be drafted, the radius of such figure as determined by the distance between the center at f and the pencil 3'. Figures of any shape may be constructed whose sides do not too abruptly approach, or recede from, the center of the figure to be drafted. The vol utes designed to be drafted by the grooves k and l can not be inscribed within a circle of such diameter, but they may be inscribed within a circle with a radius equal to the distance from the point f to the farthest end of the cylinder F. Larger or smaller volutes may be constructed by increasing the length of the cylinders and of the grooves, and if necessary to facilitate the movement of the post m in the grooves. increasing the diameter of the cylinders, and by beginning at a point in the grooves nearer the center at 7 than the said end of the cylinder F.

The groove (1 and all the grooves shown in Figs. 6 and 7, with the exception of the groove h, are symmetrical, and the reverse sides thereof need not be shown. Dotted lines representing these grooves on the reverse sides of the cylinders would be hidden by the lines delineating the portions of the threads shown. All the grooves on any one cylinder herein mentioned, except the volute grooves, have one of their farthest vertices from the center at f arranged on the cylinder in a straight line.

The cylinders containing the grooves for all figuresexcept the volutes, should be so placed in position on the axis C that the vertices of the angles of the grooves will be pointed away from the center at f; and the spokes K are located within the cylinders accordingly. The cylinders containing the grooves for the volutes, should be so placed in position on the axis C that the part of the groove having the greatest pitch will be farthest from the center at f; and the spokes K are located within the cylinders ac-.

cordingly.

The operation of the machine is effected by adjusting, in the case of any figure other than a volute, the post m into the groove corresponding to the figure to be drafted, at the vertex of the farthest angle in such groove from the center at f which is in line with the vertices of the corresponding angles of the other grooves on the same cylinder, and the pencil j at a distance of one and one-half inches from said center at f, the carriages I and J being securely screwed to the double rod, or hairpin, e, and free to slide on the tracks cl. In case a volute is to be drafted the post m should be adjusted into the groove is or Z. as the case may be, at the end of the cylinder farthest from the center at f. and the pencil 7' should be adjusted immediately thereunder, both carriages I and J being securely screwed to the double rod, or hairpin, e, and sliding freely on the tracks d. The machine is placed upon the drawing surface with the point at f at the center of the figure to be drafted, and is then pressed down sufiiciently for the pencil j to sketch legibly the figure to be drafted, and the crank D is turned by hand.

To produce any figure herein mentioned, excepting the right and the left volutes, the crank D may be turned in either direction. To produce the right and the left volutes, the crank D must be turned, if the post m be adjusted in the end of the thread farthest from the center at f, to the right and to the left. respectively.

There are features to our machine and grooves for figures not herein designated, which we do not claim; but the following is a designation of those features which we do claim.

\Ve claim:

1. In a drafting machine, the combination of a frame, a support revolubly mounted therein, a rod rotatablv secured to said support, a cylinder provided with grooves,

secured to said rod, means for rotating said cylinder during the revolution of said support comprising gears secured to said frame and rod respectively, a member adjustably secured to said support, a marker carrier slidably mounted on said member and having a post adapted to engage said grooves, and means for revolving said support.

In a drafting machine, the combination of a frame, a support revolubly mounted therein, a rod rotatably secured to said support, a cylinder provided With grooves secured to said rod, means for revolving said support, means for rotating said cylinder during the revolution of said support comprising gears secured to said frame and rod respectively, two sets of parallel tracks secured to said support and arranged one set above the other parallel to said cylinder, a marker carrier slidably mounted on the lower set, an auxiliary carrier slidably mounted on the upper set, a double rod slidably mounted in said support and slidably connected to each of said carriers, independent means for securing each carrier in adjusted position on said double rod, and a post secured to said auxiliary carrier adapted to engage said grooves.

EDWIN CLINTON KREISLE. LYNDSAY DICKASON HAWKINS.

\Vitnesses:

R. V. MURRAY, S. B. ROBERDEAN.

Copies of this patent may be obtained for five cents each. by addressing the Commissioner of Patents, Washington. D. C. 

